John Aldrich wrote:
> On Thu, 02 Nov 2000, Bret Hughes wrote:
> >
> > if the hwclock is utc I believe you need to use th -u switch to hwclock. I
> > have started using setclock with great results. Seems like I found it from
> > reading the init scripts but I forget.
> >
> Hmm...interesting I've never had to use the "-u" switch. :-)
> According to the MAN page, -utc switch means to put it INTO UTC
> mode. If you want to use *local* time, use the "-localtime" flag
> instead. Thereafter it'll default to "localtime" unless/until you
> re-run hwclock with the "-utc" flag.
> John
Huh, that is not how I interpreted it: Fom the manpage on a 6.0 box
--utc Indicates that the Hardware Clock is kept in Coor-
dinated Universal Time. It is your choice whether
to keep your clock in UTC or local time, but noth-
ing in the clock tells which you've chosen. So
this option is how you give that information to
hwclock.
In order to avoid any possible misunderstandings:
all conversation with the program hwclock is done
in local time. If you have your clock in UTC (as is
common on a Unix system) then the option --utc
tells hwclock to do the appropriate conversions:
`hwclock --show --utc' will tell you the local
time, assuming the hardware clock is in UTC, and
`hwclock --set --date="XXX" --utc' will set the
hardware clock to the UTC equivalent of the local
time XXX.
[root@compaq2 sysconfig]#cat /etc/sysconfig/clock
UTC="yes"
ARC=false
root@compaq2 /etc]# ls -al localtime
lrwxrwxrwx 1 root root 32 Nov 2 18:38 localtime ->
../usr/share/zoneinfo/US/Central
let's try a few things
[root@compaq2 sysconfig]# hwclock --show
Fri Nov 3 00:10:30 2000 -0.705657 seconds
[root@compaq2 sysconfig]# date
Thu Nov 2 18:10:31 CST 2000
[root@compaq2 sysconfig]# hwclock --show -u
Thu Nov 2 18:10:42 2000 -0.081518 seconds
now lets change the clock
[root@compaq2 sysconfig]# hwclock --show
Fri Nov 3 00:14:00 2000 -0.060926 seconds
[root@compaq2 sysconfig]# date
Thu Nov 2 18:14:01 CST 2000
[root@compaq2 sysconfig]# hwclock --systohc
[root@compaq2 sysconfig]# hwclock --show
Thu Nov 2 18:14:41 2000 -0.034053 seconds
The hwclock is now set to the system time with no UTC offset
Now lets set it using the -u option
[root@compaq2 sysconfig]# hwclock --systohc -u
Now lets look at the raw rtc time
[root@compaq2 sysconfig]# hwclock --show
Fri Nov 3 00:14:58 2000 -0.805199 seconds
now lets look at it while telling hwclock that the rtc is using UTC
[root@compaq2 sysconfig]# hwclock --show -u
Thu Nov 2 18:15:02 2000 -0.386650 seconds
[root@compaq2 sysconfig]# date
Thu Nov 2 18:15:01 CST 2000
At least on my 6.0 servers with all the errata updates this is the behavior I
am used to seeing. Maybe there is some thing I am missing but I pulled my hair
out over this stuff a couple of years ago for a while 'til I felt like I got it
right.
If this is incorrect I would greatfully accept correction. (given the proper
offset of course)
Bret
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